1. An Inverse Problem for the Sturm–Liouville Operator

   • B. N. Biyarov

   Research Articles 23 August 2021 Pages: 3 - 15

2. Projection Greedy Algorithm

   • P. A. Borodin
   • S. V. Konyagin

   Research Articles 23 August 2021 Pages: 16 - 25

3. A Note on the Symmetry of Sequence Spaces

   • D. Carando
   • M. Mazzitelli
   • P. Sevilla-Peris

   Research Articles 23 August 2021 Pages: 26 - 40

4. Sharp Inequalities for Rational Functions on a Circle

   • V. N. Dubinin

   Research Articles 23 August 2021 Pages: 41 - 47

5. Quotient Divisible Groups of Rank 2

   • M. N. Zonov
   • E. A. Timoshenko

   Research Articles 23 August 2021 Pages: 48 - 60

6. Operators of Almost Hadamard Type and Hardy–Littlewood Operator in the Space of Entire Functions of Several Complex Variables

   • O. A. Ivanova
   • S. N. Melikhov

   Research Articles 23 August 2021 Pages: 61 - 71

7. On Matrices Having \(J_m(1)\oplus J_m(1)\) as Their Cosquare

   • Kh. D. Ikramov

   Research Articles 23 August 2021 Pages: 72 - 79

8. Inverse Approximation Theorems in the Spaces \(S^{(p,q)}(\sigma^{m-1})\)

   • R. A. Lasuriya

   Research Articles 23 August 2021 Pages: 80 - 91

9. Elliptic Differential-Difference Equations of General Form in a Half-Space

   • A. B. Muravnik

   Research Articles 23 August 2021 Pages: 92 - 99

10. Some Properties of Local Cohomology Modules Defined by a Pair of Ideals

    • Nguyen Minh Tri
    • Tran Tuan Nam
    • Nguyen Thanh Nam

    Research Articles 23 August 2021 Pages: 100 - 109

11. A Sylvester–Gallai Type Theorem for Abelian Groups

    • F. K. Nilov
    • A. A. Polyanskii

    Research Articles 23 August 2021 Pages: 110 - 117

    

12. Comparison of Arithmetic, Geometric, and Harmonic Means

    • L. V. Rozovsky

    Research Articles 23 August 2021 Pages: 118 - 125

13. Bendable Surfaces without Visible Deformations of Their Shape

    • I. Kh. Sabitov

    Research Articles 23 August 2021 Pages: 126 - 134

    

14. On Asymptotic Series Expansions of Solutions to the Riccati Equation

    • V. S. Samovol

    Research Articles 23 August 2021 Pages: 135 - 144

    

15. Asymptotic Solution of the Cauchy Problem for a First-Order Differential Equation with a Small Parameter in a Banach Space

    • V. I. Uskov

    Research Articles 23 August 2021 Pages: 145 - 151

16. Rotary Mappings and Projections of a Sphere

    • J. Mikeš
    • N. I. Guseva
    • L. Rýparová

    Short Communications 23 August 2021 Pages: 152 - 155

17. Minimal Contact Circuits for a Sequence of Boolean Functions

    • N. P. Red’kin

    Short Communications 23 August 2021 Pages: 156 - 158

18. On the Volterra Factorization of the Wiener–Hopf Integral Operator

    • L. G. Arabadzhyan

    Research Articles 23 August 2021 Pages: 161 - 166

19. Inheritance of Smoothness by Extremal Functions in Bergman Spaces \(A_p\) for \(0<p<\infty\)

    • Kh. Kh. Burchaev
    • G. Yu. Ryabykh

    Research Articles 23 August 2021 Pages: 167 - 185

20. Subgroups of the Fan of Sylow Subgroups and the Supersolvability of a Finite Group

    • T. I. Vasilyeva

    Research Articles 23 August 2021 Pages: 186 - 195

21. The Fatou Property for General Approximate Identities on Metric Measure Spaces

    • G. A. Karagulyan
    • I. N. Katkovskaya
    • V. G. Krotov

    Research Articles 23 August 2021 Pages: 196 - 209

22. On Joint Universality of the Riemann Zeta-Function

    • A. Laurinčikas

    Research Articles 23 August 2021 Pages: 210 - 220

23. A Remark on the Steklov–Poincaré Inequality

    • Sh. M. Nasibov

    Research Articles 23 August 2021 Pages: 221 - 225

24. Existence of Semiregular Solutions of Elliptic Systems with Discontinuous Nonlinearities

    • V. N. Pavlenko
    • D. K. Potapov

    Research Articles 23 August 2021 Pages: 226 - 241

25. Remarks on Galois Rational Coverings

    • A. V. Pukhlikov

    Research Articles 23 August 2021 Pages: 242 - 247

26. Sharp Inequalities between the Best Root-Mean-Square Approximations of Analytic Functions in the Disk and Some Smoothness Characteristics in the Bergman Space

    • M. Sh. Shabozov
    • N. U. Kadamshoev

    Research Articles 23 August 2021 Pages: 248 - 260

27. On Epsilon-Cores of Cooperative Games with Fuzzy Payoffs

    • A. S. Shvedov

    Research Articles 23 August 2021 Pages: 261 - 266

28. Lower Bounds for the Square-to-Linear Ratio for Plane Peano Curves

    • E. V. Shchepin
    • E. Yu. Mychka

    Research Articles 23 August 2021 Pages: 267 - 272

    

29. A Note on Mock Automorphic Forms and the BPS Index

    • T. A. Wong

    Research Articles 23 August 2021 Pages: 273 - 282

30. On Entire Solutions of a Class of Second-Order Algebraic Differential Equations

    • A. Ya. Yanchenko

    Research Articles 23 August 2021 Pages: 283 - 292

31. Geodesic Mappings of Equiaffine and Ricci Symmetric Spaces

    • V. E. Berezovskii
    • N. I. Guseva
    • J. Mikeš

    Short Communications 23 August 2021 Pages: 293 - 296

32. Some Properties of Lattice Ordered Rings

    • N. E. Shavgulidze

    Short Communications 23 August 2021 Pages: 297 - 300

33. Existence of Monochromatic Simplices of Given Volume in a Colored Rational Lattice

    • V. Z. Sharich
    • A. Ya. Kanel’-Belov
    • I. A. Reshetnikov

    Short Communications 23 August 2021 Pages: 301 - 304

    

34. On Commuting Automorphisms of Finite \(p\)-Groups

    • M. Singh
    • R. Garg

    Short Communications 23 August 2021 Pages: 305 - 308